. >>> families in the south bay enjoying a winter wonderland tonight in north america. the entertainment included live shows and games. wonderland will stay at north america through january 4. children four years and under get in for free. >>> a lot of fresh new snow in the sierra tonight and an incredible example of human nature. a chain installers mission to return a lost wedding ring. >> chilling new details in the case of a fire. >>> at first, firefighters report of an an explosion in downtown san francisco. what they found on the scene. >>> a manhole cover exploded in downtown san francisco this evening. pg & e says it was caused by an underground vault fire. the blast happened around 5:00 this evening near the corner of third and mission street. the intersection was closed to traffic for a while as crews put out the fire. no one was injured and there was no power outages. >>> investigators have found a note and human remains at the home of a man who's accused of deliberately setting a fire and then shooting and killing two firefighters that arrived at the scene. d